On 11.03.20 13:14, Jan Beulich wrote:
On 10.03.2020 08:28, Juergen Gross wrote:
Add a lock specific counter to rcu read locks in debug builds. This
allows to test for matching lock/unlock calls.
Similar checking doesn't exist for e.g. spin locks iirc, and hence
I think you want to spend the word on the "why" here.
With spinlock debugging turned on there is such a check in rel_lock():
The locking cpu has to match and on unlock the locking cpu is set to
SPINLOCK_NO_CPU.
I can add something like:
"This will help top avoid cases like the one fixed by commit
98ed1f43cc2c89 where different rcu read locks were referenced in the
lock and unlock calls."
Juergen
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